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Answer Key
Grade 8 Science: Energy in Chemical Processes
1.
energy stored in the arrangement of atoms and bonds in substances
2.
a process that releases energy to the surroundings, often felt as warming
3.
a process that absorbs energy from the surroundings, often felt as cooling
4.
Answers vary: burning fuel, hand warmers, many combustion reactions
5.
Answers vary: cold packs, photosynthesis energy uptake awareness, melting ice with heat input
6.
food stores chemical energy that organisms release through cellular processes
7.
fuels store chemical energy released when they react (often with oxygen)
8.
energy moves between the system (reactants/products) and surroundings
9.
energy stored in atom/bond arrangements
10.
process releasing energy to surroundings
11.
process absorbing energy from surroundings
12.
Answers vary: combustion, hand warmer
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